Check out the f295 website. Lots of helpful folks and wonderful photos. My experience with pinhole is that everything that there's enough light to see is equally in/out of focus. I use a pinhole in a body cap with (shh, don't tell) a digital SLR, a converted Brownie box, a foamcore box with a Polaroid back or 4X5 back with paper, and the odd cookie tin/oatmeal box. If you're making your own pinholes I suggest you not mount them permanently, so that you can try to vary the size. Keep trying, it's fascinating- an empty space with a hole in it!